X=int(input())
if X-30>=0:
    print("Yes")
else:
    print("No") X=int(input()) X int(input()) int input() input if X-30>=0:
    print("Yes")
else:
    print("No") X-30>=0 X-30 X 30 0 print("Yes") print "Yes" print("No") print "No" X=int(input()) int(input()) X
X=int(input())
if X-30>=0:
    print("Yes")
else:
    print("No")